There's nothing like a bit of outside pressure to concentrate minds. In Rimbo Castle, north of the Swedish capital Stockholm, warring sides in Yemen's civil war have sat down in the same room for the first time in two years. They're not yet speaking directly to each other, but talk of prisoner swaps, airport reopenings and truces is raising hopes. Why now and not before? Because of Jamal Khashoggi. Since the Saudi journalist’s murder, policymakers in Washington have lost patience with Riyadh.